EP0464429A2 - Procédé pour la fabrication d'une feuille thermorétractable - Google Patents

Procédé pour la fabrication d'une feuille thermorétractable Download PDF

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Publication number
EP0464429A2
EP0464429A2 EP91109812A EP91109812A EP0464429A2 EP 0464429 A2 EP0464429 A2 EP 0464429A2 EP 91109812 A EP91109812 A EP 91109812A EP 91109812 A EP91109812 A EP 91109812A EP 0464429 A2 EP0464429 A2 EP 0464429A2
Authority
EP
European Patent Office
Prior art keywords
threads
plastic
thread
stretched
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91109812A
Other languages
German (de)
English (en)
Other versions
EP0464429B1 (fr
EP0464429A3 (en
Inventor
Bernd Ostermann
Winfried Stupp
Friedrich Becker
Norbert Nicolai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stewing Nachrichtentechnik & Co KG Berlin GmbH
Original Assignee
Stewing Nachrichtentechnik & Co KG Berlin GmbH
Stewing GmbH and Co KG Werk Berlin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stewing Nachrichtentechnik & Co KG Berlin GmbH, Stewing GmbH and Co KG Werk Berlin filed Critical Stewing Nachrichtentechnik & Co KG Berlin GmbH
Publication of EP0464429A2 publication Critical patent/EP0464429A2/fr
Publication of EP0464429A3 publication Critical patent/EP0464429A3/de
Application granted granted Critical
Publication of EP0464429B1 publication Critical patent/EP0464429B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
    • B29C61/0658—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms consisting of fibrous plastics material, e.g. woven
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/1806—Heat shrinkable sleeves

Definitions

  • the invention relates to a method for producing a heat-recoverable material web from at least one polymeric plastic material and a crack-limiting reinforcement insert, in particular for the formation of sheaths which can be shrunk onto cable connections and branches.
  • a crack-limiting reinforcement insert in particular for the formation of sheaths which can be shrunk onto cable connections and branches.
  • shrink sleeves, shrink sleeves, shrink housings, shrink pipes or the like can be produced with the heat-recoverable material web.
  • a tubular fabric for protecting or isolating elongated objects which is heat-shrinkable in the radial direction and heat-resistant in the axial direction, and has a thermosetting impregnation or coating in order to increase the rigidity of the product resulting from a shrinking process.
  • the heat shrinkability in the radial direction is achieved by means of heat-shrinkable weft threads or filler threads made of polymer plastic
  • the heat resistance in the axial direction is achieved by means of warp threads which are not heat-shrinkable (cf. US Pat. No. 3,669,157).
  • heat-shrinkable product which essentially consists of a heat-shrinkable fabric or the like. Textile fabrics and a polymeric coating.
  • the heat-shrinkable fabric threads on the one hand and the polymeric coating material on the other hand are specified by specifying mechanical parameters such as shrinkage stress, shrinkage temperature, elongation / temperature profile, elongation at break, etc. (cf. EP-PS 0 243 985).
  • the cuff has a textile structure with plastic threads, which reset when heated and have a minimum tensile strength at their reset temperature, the textile structure having an outer surface which is covered with a layer of polymeric material of a predetermined thickness and furthermore the polymeric material without flow is softenable when heated to adjust to the return of the cuff.
  • the layer of polymeric material is bonded to the plastic threads and forms a cover layer.
  • the cuff is heated with a burner flame which is directed against the coated surface (cf. EP 0 117 026).
  • a mat or a fabric made of intersecting strands is first formed from non-or only slightly stretchable material, wherein at least the strands running in one direction are shaped like a spiral.
  • the mat or fabric is embedded in a plastic material. The material web produced in this way is stretched in the direction of the strands running in the form of a spiral.
  • the plastic matrix or Cover material made of plastic can be heat-reset, while the mat or the fabric embedded in the plastic matrix itself has an expansion reserve due to the helical shape of the strands, even though the material of the strands themselves is not stretchable, so that the material web with the embedded mat or the Tissues can be stretched to commonly used degrees of stretch of 400% and more.
  • the mat or the fabric is embedded in the plastic material or the plastic matrix by extrusion, lamination or lamination, in the former case there is the possibility that the mat or the fabric is extrusion-coated in a continuous process with a silane-grafted polyethylene and that Polyethylene is crosslinked in the presence of water (cf. DE 38 33 415).
  • thermoplastic Plastic a plurality of individual threads running parallel to one another in one plane work continuously on both sides with webs made of thermoplastic Plastic are laminated, and that between the individual threads and at least one web a layer of threads made of tear-resistant material at heat recovery temperature is arranged (see. DE 38 31 996).
  • a method for producing a watertight cable connection from two or more cable ends with a film of polymeric material which heats up and shrinks onto the cable ends as it cools down.
  • a one- or two-dimensional shrinking knitted fabric is applied to the film (cf. DE-OS 31 50 544).
  • a composite laminate made of a polyethylene film and a polyalkylene fiber fabric is known to prevent the propagation of a crack once it has developed.
  • the composite laminate exhibits a biaxial shrinkage of at least 7.5% in one direction and at least 15% in the other direction when heated in a liquid bath at a temperature of approximately 120 ° C (cf. US Pat 3,058,863).
  • the invention is based on the object of specifying a method according to which a heat-recoverable material web can be produced in a simple and cost-saving manner, which is distinguished on the one hand by resistance to cracking, and on the other hand by shrinkage which can be adjusted in a well-defined manner in at least one direction.
  • multi-component threads are produced with a plastic sheath and a chemically crosslinkable thread core made of plastic or an elastomer that Thread cores are crosslinked, that the multicomponent threads treated in this way are stretched to a predetermined extent, that a portioned plurality of stretched multicomponent threads are then arranged in one or more layers with the setting of a predetermined main shrinkage direction and pressed under pressure / temperature until the casing material melts and connects.
  • These measures of the invention initially have the consequence that a homogeneous material composite between the outer thread coating and the thread cores is achieved.
  • a composite structure is created with cross-linked and stretched thread strands, which are preferably arranged in parallel or at a certain angle.
  • a connection with non-heat-recoverable threads lying perpendicular to the main direction of shrinkage is also conceivable.
  • Such a composite structure is characterized by a high, precisely adjustable heat shrinkability in the longitudinal direction of the thread strands, for example 40% to 90%, while shrinking orthogonal to the longitudinal direction of the stretched thread strands is in the range from 0% to 50%.
  • the thread strands form, as it were, tear barriers, ie a tear that has formed can only continue to the next thread strand and is stopped there, so that the composite structure according to the invention is not only distinguished by well-defined shrinkage ratios in the longitudinal direction of the thread strands in particular, but also through high tear resistance.
  • the material web according to the invention can be produced easily and cost-effectively.
  • threads lying orthogonal to the main shrinking direction can be dispensed with because of the interweaving of the multi-component threads aligned in the main shrinking direction, because a sufficient transverse binding is achieved by the interlocking troughs or peaks of the corrugated thread strands.
  • the invention thus provides that the multicomponent threads are produced with plastic / silane cores or peroxide cores and are crosslinked by means of conditioning. Furthermore, there is also the possibility that a plurality of stretched multi-component threads are placed side by side close to one another in close proximity or at close intervals and placed with heat-stable, non-shrinking threads transverse to the main direction of shrinkage or in the way a binding fixed, e.g. B. intertwined, linked or woven.
  • the multi-component threads are preferably produced by coextrusion.
  • the invention further recommends that the multi-component threads are co-extruded with a plastic sheath made of polyethylene and with a thread core made of polyethylene covered with silane.
  • a substantially homogeneous composite structure with thread strands is achieved through the essentially identical use of plastic for the shell and core.
  • the notch radius is infinite and tearing is impossible.
  • the cross-linked and drawn strands form tear barriers.
  • the multicomponent threads are stored at a temperature in the range from 80 ° C. to 190 ° C., preferably at 80 ° C. to 95 ° C., in an aqueous atmosphere.
  • the surface of the composite structure can subsequently be crosslinked with a small surface dose of 3 kGy to 30 kGy or reinforced by a subsequent coating using undrawn material.
  • multi-component threads 1 are coextruded with a plastic sleeve 2 and a thread core 3.
  • the thread core 3 consists of a chemically crosslinkable plastic or elast.
  • the plastic cover 2 consists of polyethylene and the thread core 3 consists of polyethylene covered with silane.
  • the thread cores are networked by conditioning.
  • the multi-component threads 1 treated in this way are stretched by a predetermined amount.
  • a portioned plurality of stretched multicomponent threads 1 are placed next to one another in a tightly sealed manner in parallel position and pressed under pressure and temperature application until the casing material melts and joins.
  • the multi-component threads 1 are first drawn and then corrugated. Then a portioned plurality of corrugated multicomponent threads is formed in a single layer to form a mat-like braid with the setting of a predetermined main shrinking direction arranged transversely to the main direction of shrinkage intermeshing wave valleys or wave crests and also pressed under pressure or application of temperature until the casing material melts and connects. In this case, sufficient cross stability is ensured by the interlocking corrugated multi-component threads 1. In the embodiment with the multi-component threads 1 arranged in parallel, they can be fixed with plastic threads, not shown, placed or connected transversely to the main shrinking direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP91109812A 1990-06-30 1991-06-14 Procédé pour la fabrication d'une feuille thermorétractable Expired - Lifetime EP0464429B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020931A DE4020931C2 (de) 1990-06-30 1990-06-30 Verfahren zum Herstellen einer wärmerückstellbaren Werkstoffbahn
DE4020931 1990-06-30

Publications (3)

Publication Number Publication Date
EP0464429A2 true EP0464429A2 (fr) 1992-01-08
EP0464429A3 EP0464429A3 (en) 1992-09-16
EP0464429B1 EP0464429B1 (fr) 1995-09-06

Family

ID=6409444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109812A Expired - Lifetime EP0464429B1 (fr) 1990-06-30 1991-06-14 Procédé pour la fabrication d'une feuille thermorétractable

Country Status (3)

Country Link
EP (1) EP0464429B1 (fr)
DE (2) DE4020931C2 (fr)
PT (1) PT98130A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018081669A1 (fr) * 2016-10-28 2018-05-03 Federal-Mogul Powertrain Llc Manchon rétractable à cavités multiples et son procédé de construction

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE556321A (fr) * 1956-04-04 1900-01-01
US3669157A (en) * 1970-06-01 1972-06-13 Carolina Narrow Fabric Co Shrinkable tubular fabric
DE3150544A1 (de) * 1981-12-21 1983-06-30 Siemens AG, 1000 Berlin und 8000 München Isolierende, wasserdichte kabelendenisolierung
IN159633B (fr) * 1983-01-06 1987-05-30 Raychem Corp
US4631098A (en) * 1983-01-06 1986-12-23 Raychem Limited Heat-recoverable article
GB2204888A (en) * 1987-05-18 1988-11-23 Textilver Sa Fibre reinforced matrix
DE3806660C2 (de) * 1988-03-02 1995-04-13 Kabelmetal Electro Gmbh Wärmerückstellbare Manschette zum Umhüllen eines Substrates
DE3831998A1 (de) * 1988-07-13 1990-01-25 Kabelmetal Electro Gmbh Langgestreckter formstrang aus einem vernetztem polymer
DE3831996A1 (de) * 1988-09-21 1990-03-29 Kabelmetal Electro Gmbh Verfahren zum herstellen von waermerueckstellbaren baendern aus kunststoff
DE3833415C2 (de) * 1988-10-01 1996-08-14 Kabelmetal Electro Gmbh Verfahren zur Herstellung eines wärmerückstellbaren Bandes
EP0350732B1 (fr) * 1988-07-13 1995-12-27 kabelmetal electro GmbH Câble formé, élité

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018081669A1 (fr) * 2016-10-28 2018-05-03 Federal-Mogul Powertrain Llc Manchon rétractable à cavités multiples et son procédé de construction
US10393307B2 (en) 2016-10-28 2019-08-27 Federal-Mogul Powertrain Llc Multi-cavity, shrinkable sleeve and method of construction thereof

Also Published As

Publication number Publication date
EP0464429B1 (fr) 1995-09-06
PT98130A (pt) 1993-08-31
DE59106405D1 (de) 1995-10-12
DE4020931A1 (de) 1992-01-02
EP0464429A3 (en) 1992-09-16
DE4020931C2 (de) 1994-01-27

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